Investigators are trying to determine if this latest incident is related to four others in the same area.

In the last attack on June 24, another woman was walking alone on the same street around the same time of night when she too was knocked unconscious from behind.

Three days before that on June 21, a lone woman was traveling in the 2700 block of Lincoln Avenue around 9:40 p.m. Two suspects came behind her and hit her to the ground. As one suspect tried to pull her clothes off, she yelled for help, and the suspects ran off.

Another woman on Meade Avenue was attacked by two men on June 17. When she fought back, the suspects fled, police say.

On June 11, a victim was thrown to the ground by a man on 33rd Street. She told police the man tried to force himself on her, but a vehicle drove down the street and likely scared him off.

As for suspect descriptions, the victim in the June 17 incident was the only one to get a good look at her attackers.

The first is described as a man about 28 to 29 years old, 6-feet tall, wearing a hooded sweatshirt. The second suspect is described as a man about 23 to 24 years old, 5-foot-7 to 5-foot-8, wearing a black shirt and braces.

Police continue to warn people not to walk alone at night in North Park. According to SDPD June statistics, 3.8 percent of sex crimes reported in San Diego this year have happened in North Park, compared to 3.3. percent last year.